linux-kernel - Re: [PATCH 12/13] cpufreq: intel_pstate: Supply struct attribute description for get_aperf_mperf

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Date:   Wed, 15 Jul 2020 14:38:51 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH 12/13] cpufreq: intel_pstate: Supply struct attribute
 description for get_aperf_mperf_shift()

On Tue, Jul 14, 2020 at 11:28 PM Lee Jones <lee.jones@...aro.org> wrote:
>
> On Tue, 14 Jul 2020, Rafael J. Wysocki wrote:
>
> > On Tue, Jul 14, 2020 at 4:51 PM Lee Jones <lee.jones@...aro.org> wrote:
> > >
> > > Fixes the following W=1 kernel build warning(s):
> > >
> > >  drivers/cpufreq/intel_pstate.c:293: warning: Function parameter or member 'get_aperf_mperf_shift' not described in 'pstate_funcs'
> > >
> > > Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> > > Cc: Len Brown <lenb@...nel.org>
> > > Cc: Dirk Brandewie <dirk.j.brandewie@...el.com>
> > > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > > ---
> > >  drivers/cpufreq/intel_pstate.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> > > index 44c7b4677675d..f92fc69c87269 100644
> > > --- a/drivers/cpufreq/intel_pstate.c
> > > +++ b/drivers/cpufreq/intel_pstate.c
> > > @@ -275,6 +275,8 @@ static struct cpudata **all_cpu_data;
> > >   * @get_min:           Callback to get minimum P state
> > >   * @get_turbo:         Callback to get turbo P state
> > >   * @get_scaling:       Callback to get frequency scaling factor
> > > + * @get_aperf_mperf_shift: Callback to get the number of clock cycles after
> > > + *                     aperf, merf is incremented
> >
> > This added description is inaccurate.  It should be something like
> > "Callback to get the APERF vs MPERF frequency difference".
>
> Does that mean the description of @aperf_mperf_shift above is also
> incorrect?

It is slightly unclear, let me improve it.

Thanks!